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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2520a3ad8f635bc931dce962b74b0e9ff6387e89f97b4554e5ea4c77890d3cd0' 
  AND token = 'KG9AQcHVsZ/9Ot6Sf89UEODBD3ZaLrZltrP/A5qK0vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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