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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a558bfa66c2193e36444b681b4e4b14acb7a24f72a8434f40890d17402c894b' 
  AND token = '8ErPk0PR+U65m4xUMmOZvnVf6Vl36Of+bUS0wc0Iofw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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