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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafc52bd055a7f62436715bf1881b5a1ea154e60df511f21df3625dfd2dcd750' 
  AND token = 'H7Q+kkZn3bLIzKHNJQ68wMdoGEBWxxQ3ZoYB6AS13wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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