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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446e45b8593ed33cb568596187e8ed20d89ecf904bf1402a9ed6da53c28657f5' 
  AND token = 'SMtvFu6cvS05m+5XfHlzhQ9Rl2ysbAgDLx4+gmng6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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