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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19dfbbbe124b1ae61d3b75ea8ea6fdd7649c0ccbde01eaa8909732dd70277cc7' 
  AND token = 'jNDsscpe5Ne6xcA5AbO0PvLUqxG04a0fc2VZ44WYNUw=' 
  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"
    }
  }
}