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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7536ad5f675944f8ed1fe1627d71c3a218823cc7d6d8f9246a6be03d9c7eee' 
  AND token = 'UFAyBgBh6YUBIv4DS6b7te9llM27BPmLWKiCpRa1uyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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