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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36287809edeb00b46e1c3069c81610515371517ab2858f1795a6be085d526e8d' 
  AND token = 'hbH5IfLSzsZCBKZ49u343EgRXUVgk0L7Far3oK3K4yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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