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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476304b5253bf077a0431f30481d393dfde4a2447eda794e3ef716df7f1d46a1' 
  AND token = 'cL+hHyE060n1j715MKa8cJchmCIwz1qfO7UiJLq5kmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}