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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b899fbd8470880836f3f5ca0721fd3ed64deeb60a2c3674b6ae7e283bfc3630' 
  AND token = '/EXLt5MCsWU61U6bKvqF+c4VN0iFzNSwz9AuNqYDHM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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