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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eda4cea4030d784b69cfc65be17d6e43f0725f1a3e9749e1ef627bd7a83bc05' 
  AND token = 'x/glZ3wj5ra9cR4jQCo5amKmHwVvgBw8BHE5B8F9tsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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