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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a55035d5b0fa2e8ab5a94379caec13bc2c54ca39a7e0730f60c880340950811' 
  AND token = 'bbFqZpq723sykz1nUhg3S2ObZZqI7c2dx8Q+dEO2a6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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