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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff92b2ee5c9f71881733cc6304f8a3b427304fc542d37b8315e9e93fc2376f5c' 
  AND token = 'k/lrXQaX1sOUMKvHUns+56QXUgORcUCdywUuU2lAs2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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