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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78115c54d7e551e712923eadb21c02f8fdbb9d8de1dd2e6cea985d7bf56f4bba' 
  AND token = 'qqba5zmZK3Uab/V9fKqJypnM6PJzv+Au0yMjCbucY5Y=' 
  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"
    }
  }
}