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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb90a32a4faafe7ab6a1a524a7337583c44563705446a40de6dbbb8c4b30e790' 
  AND token = 'z8aTg7/IJLPg2R3gNQJY+xpmWTrlI7qJx1hIpkWBqvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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