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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03ebe6697e13cedbe8edd2a46dd2b62f4fd95d8a12f7b23bef3406933d61280' 
  AND token = 'fY7M4icNNCKh9FZ3S+gIhrUuzcPLOeQ4YzlnUd8wy1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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