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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bd96a37a10ca36d6c8961d4d20e12bfd3b131eda89e4b2c9a37f5cf273323c' 
  AND token = 'e2IEpvNSf8uBjn67fS+bYokkx41M466P/MMtr8pHthk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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