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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac79e880d411e232567f71069a0be42e9a01c8f717492c34369a025a1cc1d950' 
  AND token = '85J1os4TH6khuSlYHgmagQehSwSr6J5ahhEdthujeYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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