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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdacd97a84458da01081eacb0897f27121b69b92ee0a9d4d79a48299af2e3d5e' 
  AND token = 'tUXr1svk+pi+hqwEUjj4BJ2SPa0plmRhtCmrlQYYXlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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