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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e25caf4e395ce3ec3b6fd1131e70a37d8f9374e50fda38be898364b472b417' 
  AND token = '5pXl0uyssAEVFlciQaJPrMI8Li0h3AUAQz1nGJSsnik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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