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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1708323db690ce143941b09de4c763520399dd8dc480b0f58b87ab357efcb9ee' 
  AND token = 'MrMztcXg7vZh8+OHH3wdfx2g34tA59Vg6kT5E2q3CGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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