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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bdfcceea0fa6a09207af6a3aa8ced413a35198f96119b41eb5a91976831c403' 
  AND token = 'WUUE1aX8U7Gm22EusP6T0yu5H2eVTdFkA4YV5lk21eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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