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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44194f3e72de0dbfbfd1999d1e5a1242daa425eff0e33707afbf5a0512587ba8' 
  AND token = 'IZzRQREDIbXXdNDKPCgv2ULbaS+4MsY/a84Tiy+wa/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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