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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadc611fec805c49a52f6ff6c25170dd4e865e83f95c46685861c7c82fae3b76' 
  AND token = 'ec098c+papDjxlvYYzS+AYWi28ez1dZUKC1MQZTJV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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