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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c644ff83f6eb69ee751b3986aa5e0c3e2444c63c23ed406bd0044b48876d90' 
  AND token = '8wu7VfCV4rOoQS0O0CjhROdcDphody4FOCzeXq7fSII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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