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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3753c6c40bec46359abaaebe3fa217aa71e3a5625620ee089958cb63c3a2bec4' 
  AND token = 'sJB+T5mpCaGhPEL8kN5sVe1dwdEvLaX/G6l9aQFqT+g=' 
  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"
    }
  }
}