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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1417b0e7f813a47f2b6b6eca6258b514c71174bb9bec4d93cf6a2f5c347f8d13' 
  AND token = '5an8k/gZODieFDecq3hRTDMlBYZLfVS8jimJNh02d4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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