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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0531f8e78f064c2851457fc3416c07c79305d508b8120b814f0d7022a059ad6' 
  AND token = 'RoyT62AbGjgQJUZ+I00v7uEJ9P4cPlYO4mH5UIr0cAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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