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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbe071200d7a10338ed237cb8feec245194cefb758ac65850a1fbc8c8b4e002' 
  AND token = 'kBX9vqqnC7lb3zqfrxV+51TJB080SQpIC5igySVRA0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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