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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab03a3b4db8cdc1978ae49e6023ab1242e6065db240e6d5314070714c77fd028' 
  AND token = 'qRPPH3vPwMJsIfbvHnNh+GTEA4tZRu4VQ0oI9KP8zX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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