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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ac4e1d2b98a17bd273fea12beaf591fe4a8885753ae0b2f7f82fa55db2c14d' 
  AND token = '8UZQwlVfD4GOKFZMx3LJpycYz2YoSZM1LJxRmLNCNTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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