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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dba68b8ac88461297e930b520ae78d3dc3531df3bbdc6e010382c2b0b2bb92' 
  AND token = 'rxVhqdfAIIk1tUxAYBAn1A4CiUVpmGAar2My74a9KO0=' 
  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"
    }
  }
}