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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47842bdc09c44757a8fccccc57c40e5d94c1e7ddd7453e443417e58420720f53' 
  AND token = 'KojidcJasQqBrQHsZgdRysh/4MMz5lnh7CvqlBiP11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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