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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6948f74fe81b1504495eb527794509727ce3c720746e9e9a4d2b8db1640c08c4' 
  AND token = '7D5pbKF/SucvyEgpOd0IhIFGqrE9LeCCm0NbJf0+YR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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