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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '566bb57b95fbfd04124b77f6a6245b8594505a31cab94d0a7ff4d4e98c11043f' 
  AND token = '/f5wIEx/mGXd10Zjyjhqko3yPOqXSNwZ25PqtjC30W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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