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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3ec9bfa45ce2a84f497d3ff324ced6d0124beeada92689a06541a6bebf5cbb' 
  AND token = 'L3jotQMwxT3Jiqf9ymerA+X8al/vPg3nDerOdyw7umg=' 
  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"
    }
  }
}