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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ac4a8331e6812ba5db2497df489c4d173539b3e242f565cce43dc5fd452059' 
  AND token = 'kmpBjytYXEa9tMoNrjrdlrB498qWZ+49hcyBvSkNLjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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