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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9fab84763903b01c80b6e556c354c81e08285b1f0242f619c2dafccd837c87' 
  AND token = 'Ie7EsMPoTzBQzl07hXAoYilr8NzT4flSugkbHPhQnCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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