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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '573c43949d196c249cfbbe51b15080ddb19deadcbf91f1f3e1a3e8879c999c11' 
  AND token = 'sKMlWHfN08QqmlDZZxzPtHnrosJV/17aX26NKH8c5V4=' 
  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"
    }
  }
}