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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c695565fa8aeca2c659ae64af159c50c78e1ceb614539b4be66be128b85bad' 
  AND token = 'hZZP/ULUp57LRde7W415dR0nKsp/ZvAMnCUYmglE82M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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