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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13309f25ad50f514fdb75464a3db59cb86dd102bf515411534ffe83e667a05a' 
  AND token = 'SI2WzmOkgbmJRsefuQEDv1vYovXc/HzBrz+Z1/EPvY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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