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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3717cbf48313dad16d59bf9c3f6ccae4f48c0e31329a2d654930c609f66da31' 
  AND token = 'MAYuM2Ru5+oFFNBgNf2BUDztohA20PrW9gJY075YQzg=' 
  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"
    }
  }
}