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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c26011717604436230f48745c18336b0912239864440d912bb502d1424fc06f' 
  AND token = 'Rz+SsDCCc/nJ5OnBuidn/CJ3xUkOp62Q3+eJa/hAwnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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