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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0b2fb3a5e7368eae39ff58418d38379d69bad1843777ea9b4673c3b7249349' 
  AND token = '7qSQP0CWe5SUJby5wGyKyEmJBWw++eNOqiAUY4eBV48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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