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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fea3d8f4a3bfa3704a7813d172083df525dff700a4d4d24d70d0d7d6e9a0ce5' 
  AND token = 'vdQt3AQzUi0rfhcDcaM1iLR+ikuT1eGCfd2lxJ1iNcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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