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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf558dff180c707d2c2e36dbf84d1a269d0caed4f80fa98492363834493bd326' 
  AND token = 'm6nJ2olsXLsGpNLIktep4/uNY9ZP17pmACM/C2TvgWU=' 
  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"
    }
  }
}