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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863d911ae2cc4d8649595fce5da27b7199d2a9332f897fe73c7befd1ee74e9df' 
  AND token = 'UG10XRbltqhpcN7JctrouYOcgoNg27w316UiAnKP9BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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