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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf07f76f9270f3be420fc452ef8cab10b5a2c05132c170b63ef7ddc7b49028d' 
  AND token = 'PQ6FgJxi1GQg6xQQg55YB5P/gAlyKWuVnFHKhQ6kEmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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