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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13c58b31df8e552704b5612daa036bea3759d7e9931603efbe04fcb6da3411a' 
  AND token = 'dlK77FJ87HSDeN6QyIFnIE7Crz9vw6LYIGSqLXJNf6E=' 
  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"
    }
  }
}